<template>
  <el-select :value="valueTitle" :clearable="clearable" @clear="clearHandle" size="small">
    <el-option :value="valueTitle" :label="valueTitle" class="options">
      <el-tree
        id="tree-option"
        ref="selectTree"
        :accordion="accordion"
        :data="options"
        :props="props"
        :node-key="props.value"
        :default-expanded-keys="defaultExpandedKey"
        @node-click="handleNodeClick">
      </el-tree>
    </el-option>
  </el-select>
</template>

<script>
  import request from "@/utils/requestutil";
  export default {
    name: "el-tree-select",
    props:{
      // 配置项
      props:{
        type: Object,
        default: {
          value:'id',
          label: 'name',
          children: 'children'
        }
      },
      value:{ type: Number, default: 0 },
      clearable:{ type:Boolean, default: true },
      accordion:{ type:Boolean, default: false }
    },
    data() {
      return {
        valueId: null,
        valueTitle:'',
        defaultExpandedKey:[],
        options:[]
      }
    },
    mounted(){
      let that = this;
      this.valueId = this.value;

      request({
        url: this.props.configUrl,
        data: {flag: this.props.flag},
        method: 'post'
      }).then(res => {
        request({
          url: this.props.dataUrl,
          method: 'post',
          data: {pid: "", templet: res.category.queryTemplet, level: this.props.level}
        }).then(res => {
          let cloneData = JSON.parse(JSON.stringify(res.data))
          that.options = cloneData.filter(father=>{
            let branchArr = cloneData.filter(child=>father.id == child.pid);
            branchArr.length>0 ? father.children=branchArr : ''
            return father.pid=="";
          });
        });
      });

      setTimeout(()=>{
        this.initHandle()
      },1000)
    },
    methods: {
      initHandle(){
        // debugger
        // console.log(this.$refs.selectTree)
        // console.log(this.$refs.selectTree.getNode(this.valueId))
        if (this.$refs.selectTree.getNode(this.valueId)){
          this.valueTitle = this.$refs.selectTree.getNode(this.valueId).data[this.props.label]
          this.$refs.selectTree.setCurrentKey(this.valueId)
          this.defaultExpandedKey = [this.valueId]
          this.initScroll()
        }

      },
      initScroll(){
        this.$nextTick(()=>{
          let scrollWrap = document.querySelectorAll('.el-scrollbar .el-select-dropdown__wrap')[0]
          let scrollBar = document.querySelectorAll('.el-scrollbar .el-scrollbar__bar')
          scrollWrap.style.cssText = 'margin: 0px; max-height: none; overflow: hidden;'
          scrollBar.forEach(ele => ele.style.width = 0)
        })
      },
      handleNodeClick(node){
        this.valueTitle = node[this.props.label]
        this.valueId = node[this.props.value]
        this.$emit('getValue',this.valueId)
        this.defaultExpandedKey = []
      },
      clearHandle(){
        this.valueTitle = ''
        this.valueId = null
        this.defaultExpandedKey = []
        this.clearSelected()
        this.$emit('getValue',null)
      },
      clearSelected(){
        let allNode = document.querySelectorAll('#tree-option .el-tree-node')
        allNode.forEach((element)=>element.classList.remove('is-current'))
      }
    },
    watch: {
      value(){
        this.valueId = this.value
        this.initHandle()
      }
    },
  }
</script>

<style scoped>
  .el-scrollbar .el-scrollbar__view .el-select-dropdown__item{
    height: auto;
    max-height: 274px;
    padding: 0;
    overflow: hidden;
    overflow-y: auto;
  }
  .el-select-dropdown__item.selected{
    font-weight: normal;
  }
  ul li >>>.el-tree .el-tree-node__content{
    height:auto;
    padding: 0 20px;
  }
  .el-tree-node__label{
    font-weight: normal;
  }
  .el-tree >>>.is-current .el-tree-node__label{
    color: #409EFF;
    font-weight: 700;
  }
  .el-tree >>>.is-current .el-tree-node__children .el-tree-node__label{
    color:#606266;
    font-weight: normal;
  }
</style>
